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Understanding how Open Interest and Volume is calculated isn't important to option trading. It would be interesting to know - but not essential.

That's correct ...... and open interest stays the same.

I always thought the Volume was added to the Open Interest the next day. I find it hard to believe that 50K volume consisted of an equal split of buying and selling. So maybe other factors affect the Open Interest?

You hedge by going short the underlying - is that correct? With AMZN you were short the shares also.

Just buy-and-hold.

Been there done that - with 1999 Chevy Venture Minivan.

Germany out. They finished at the bottom of Group F. The odds are always changing: Brazil $1.00 / $4.70 Spain $1.00 / $4.70 Belgium $1.00 / $6.50

Now the hard part........ Applying that to a trade in the real world. Have you given up on the butterflies?

I wonder if anybody has bought some "cheap" weekly options on Thursday for a 1-day trade and then finding out on Friday that the market is closed due to the Good Friday holiday. Holidays don't fall on a Friday very often.

Perhaps it's an incentive to short selected stocks. I think IB has the largest assortment of stocks to short and they would like to move inventory.

The odds have changed again - I assume the odds are updated weekly. Brazil is now at $1.00 / $5.90 Spain has the lowest odds at $1.00 / $5.10 Germany is at $1.00 / $7.50 https://www.playnow.com/sports/2018-fifa-world-cup-russia/world-cup-2018

No Fear or Greed.

How does Blue Origin define "trips into space" - I suspect the trip will be not even be 1 orbit around earth, more like a sub-orbit trip and land 100 miles away.

It was a bad day for butterflies - and most option positions.

OK.......

Bid/ask 3.20/9.30 And your fat finger limit order was to sell at $2.90? Limit orders are your price or BETTER - should have been filled at $3.20. IMO ....... $0.30 is no big deal.

Wasn't your question answered in your how to lock profits thread? It isn't rocket science.

Depends on your view of GE. How do you think it will move while your trade is open? Perhaps there are better option strategies than the butterfly.

The original account was 50K. Why was the 500K settlement so much higher? Must be a typo.

If the order has to be filled use Market order. Otherwise use Limit order.